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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/empty.html" title="cpp/string/basic string/empty"><span class="t-lines"><span>basic_string::empty</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/swap.html" title="cpp/string/basic string/swap"><span class="t-lines"><span>basic_string::swap</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5">搜索</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/find.html" title="cpp/string/basic string/find"><span class="t-lines"><span>basic_string::find</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/rfind.html" title="cpp/string/basic string/rfind"><span class="t-lines"><span>basic_string::rfind</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/find_first_of.html" title="cpp/string/basic string/find first of"><span class="t-lines"><span>basic_string::find_first_of</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/find_first_not_of.html" title="cpp/string/basic string/find first not of"><span class="t-lines"><span>basic_string::find_first_not_of</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/find_last_of.html" title="cpp/string/basic string/find last of"><span class="t-lines"><span>basic_string::find_last_of</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/find_last_not_of.html" title="cpp/string/basic string/find last not of"><span class="t-lines"><span>basic_string::find_last_not_of</span></span></a></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5">常量</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/npos.html" title="cpp/string/basic string/npos"><span class="t-lines"><span>basic_string::npos</span></span></a></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h1"><td colspan="5">非成员函数</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/operator%2B.html" title="cpp/string/basic string/operator+"><span class="t-lines"><span>operator+</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/swap2.html" title="cpp/string/basic string/swap2"><span class="t-lines"><span>swap<span class="t-dsc-small">(std::basic_string)</span></span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/operator%2522%2522s.html" title='cpp/string/basic string/operator""s'><span class="t-lines"><span>operator""s</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/erase2.html" title="cpp/string/basic string/erase2"><span class="t-lines"><span>erase<span class="t-dsc-small">(std::basic_string)</span></span><span>erase_if<span class="t-dsc-small">(std::basic_string)</span></span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> I/O</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/operator_ltltgtgt.html" title="cpp/string/basic string/operator ltltgtgt"><span class="t-lines"><span>operator&lt;&lt;</span><span>operator&gt;&gt;</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/getline.html" title="cpp/string/basic string/getline"><span class="t-lines"><span>getline</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5">比较</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/operator_cmp.html" title="cpp/string/basic string/operator cmp"><span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator&lt;</span><span>operator&gt;</span><span>operator&lt;=</span><span>operator&gt;=</span><span>operator&lt;=&gt;</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5">数值转换 <span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/stol.html" title="cpp/string/basic string/stol"><span class="t-lines"><span>stoi</span><span>stol</span><span>stoll</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/stoul.html" title="cpp/string/basic string/stoul"><span class="t-lines"><span>stoul</span><span>stoull</span></span></a></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/stof.html" title="cpp/string/basic string/stof"><span class="t-lines"><span>stof</span><span>stod</span><span>stold</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/to_string.html" title="cpp/string/basic string/to string"><span class="t-lines"><span>to_string</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/to_wstring.html" title="cpp/string/basic string/to wstring"><span class="t-lines"><span>to_wstring</span></span></a></div></div></td></tr>
</table></div></td></tr>
<tr class="t-nv-h1"><td colspan="5">辅助类</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/hash.html" title="cpp/string/basic string/hash"><span class="t-lines"><span>hash<span class="t-dsc-small">&lt;std::string&gt;</span></span><span>hash<span class="t-dsc-small">&lt;std::wstring&gt;</span></span><span>hash<span class="t-dsc-small">&lt;std::u32string&gt;</span></span><span>hash<span class="t-dsc-small">&lt;std::u16string&gt;</span></span><span>hash<span class="t-dsc-small">&lt;std::u8string&gt;</span></span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_string/hash.html" title="cpp/string/basic string/hash"><span class="t-lines"><span>hash<span class="t-dsc-small">&lt;std::pmr::string&gt;</span></span><span>hash<span class="t-dsc-small">&lt;std::pmr::wstring&gt;</span></span><span>hash<span class="t-dsc-small">&lt;std::pmr::u32string&gt;</span></span><span>hash<span class="t-dsc-small">&lt;std::pmr::u16string&gt;</span></span><span>hash<span class="t-dsc-small">&lt;std::pmr::u8string&gt;</span></span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
</table></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> <a href="basic_string/deduction_guides.html" title="cpp/string/basic string/deduction guides">推导指引</a><span class="t-mark-rev t-since-cxx17">(C++17)</span></td></tr>
</table></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
<tr class="t-dsc-header">
<td> <div>定义于头文件 <code><a href="../header/string.html" title="cpp/header/string">&lt;string&gt;</a></code>
 </div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <br>
<p>    <span class="kw1">class</span> CharT, <br>
    <span class="kw1">class</span> Traits <span class="sy1">=</span> <a href="char_traits.html"><span class="kw1258">std::<span class="me2">char_traits</span></span></a><span class="sy1">&lt;</span>CharT<span class="sy1">&gt;</span>, <br>
    <span class="kw1">class</span> Allocator <span class="sy1">=</span> <a href="../memory/allocator.html"><span class="kw700">std::<span class="me2">allocator</span></span></a><span class="sy1">&lt;</span>CharT<span class="sy1">&gt;</span><br>
</p>
<span class="sy1">&gt;</span> <span class="kw1">class</span> basic_string<span class="sy4">;</span></span></div></td>
<td> (1) </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl t-since-cxx17">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">namespace</span> pmr <span class="br0">{</span><br>
<p>    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">=</span> <a href="char_traits.html"><span class="kw1258">std::<span class="me2">char_traits</span></span></a><span class="sy1">&lt;</span>CharT<span class="sy1">&gt;&gt;</span><br>
    <span class="kw1">using</span> basic_string <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">basic_string</span><span class="sy1">&lt;</span> CharT, Traits,<br>
                                            std<span class="sy4">::</span><span class="me2">polymorphic_allocator</span><span class="sy1">&lt;</span>CharT<span class="sy1">&gt;&gt;</span><br>
</p>
<span class="br0">}</span></span></div></td>
<td> (2) </td>
<td> <span class="t-mark-rev t-since-cxx17">(C++17 起)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>类模板 <code>basic_string</code> 存储并操纵作为非数组<a href="../named_req/TrivialType.html" title="cpp/named req/TrivialType">平凡</a><a href="../named_req/StandardLayoutType.html" title="cpp/named req/StandardLayoutType">标准布局类型</a>的仿 <a href="../language/types.html#.E5.AD.97.E7.AC.A6.E7.B1.BB.E5.9E.8B" title="cpp/language/types"><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span></a> 对象序列。该类既不依赖字符类型，亦不依赖该类型上的原生操作。操作的定义通过 <code>Traits</code> 模板形参—— <span class="t-lc"><a href="char_traits.html" title="cpp/string/char traits">std::char_traits</a></span> 的特化或兼容特性类提供。 <code>Traits::char_type</code> 和 <code>CharT</code> 必须指名同一类型；否则程序为病式。
</p><p><code>basic_string</code> 是相继存储的，即对于 <code>basic_string</code> <code>s</code> ，对任何 <code>[0, s.size())</code> 中的 n 有 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">&amp;</span><span class="sy2">*</span><span class="br0">(</span>s.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> n<span class="br0">)</span> <span class="sy1">==</span> <span class="sy3">&amp;</span><span class="sy2">*</span>s.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> n</span></span> ，或等价地，指向 <code>s[0]</code> 的指针能传递给期待指向<span class="t-rev-inl t-since-cxx11"><span>空终止</span> <span><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></span></span> <code>CharT[]</code> 数组首元素指针的函数。
</p><p><code>std::basic_string</code> 满足<a href="../named_req/AllocatorAwareContainer.html" title="cpp/named req/AllocatorAwareContainer"><i>具分配器容器</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(AllocatorAwareContainer)</span> </a>、<a href="../named_req/SequenceContainer.html" title="cpp/named req/SequenceContainer"><i>序列容器</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(SequenceContainer)</span> </a><span class="t-rev-inl t-since-cxx17"><span>及<a href="../named_req/ContiguousContainer.html" title="cpp/named req/ContiguousContainer"><i>连续容器</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(ContiguousContainer)</span> </a></span> <span><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></span></span>的要求
</p><p>提供数个对于常用字符类型的 typedef ：
</p>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于头文件 <code>&lt;string&gt;</code> </div>
</td></tr>

<tr class="t-dsc-sep">
<td colspan="2">  
</td></tr>
<tr class="t-dsc-hitem">
<td>  类型
</td>
<td>  定义
</td></tr>


<tr class="t-dsc">
<td>  <span class="t-lc"><strong class="selflink">std::string</strong></span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_string</span><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span></span></span>
</td></tr>

<tr class="t-dsc">
<td>  <span class="t-lc"><strong class="selflink">std::wstring</strong></span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_string</span><span class="sy1">&lt;</span><span class="kw4">wchar_t</span><span class="sy1">&gt;</span></span></span>
</td></tr>

<tr class="t-dsc">
<td>  <span class="t-lc">std::u8string</span> <span class="t-mark-rev t-since-cxx20">(C++20)</span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_string</span><span class="sy1">&lt;</span>char8_t<span class="sy1">&gt;</span></span></span>
</td></tr>

<tr class="t-dsc">
<td>  <span class="t-lc"><strong class="selflink">std::u16string</strong></span> <span class="t-mark-rev t-since-cxx11">(C++11)</span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_string</span><span class="sy1">&lt;</span><span class="kw4">char16_t</span><span class="sy1">&gt;</span></span></span>
</td></tr>

<tr class="t-dsc">
<td>  <span class="t-lc"><strong class="selflink">std::u32string</strong></span> <span class="t-mark-rev t-since-cxx11">(C++11)</span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_string</span><span class="sy1">&lt;</span><span class="kw4">char32_t</span><span class="sy1">&gt;</span></span></span>
</td></tr>

<tr class="t-dsc">
<td>  <span class="t-lc"><strong class="selflink">std::pmr::string</strong></span> <span class="t-mark-rev t-since-cxx17">(C++17)</span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">pmr</span><span class="sy4">::</span><span class="me2">basic_string</span><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span></span></span>
</td></tr>

<tr class="t-dsc">
<td>  <span class="t-lc"><strong class="selflink">std::pmr::wstring</strong></span> <span class="t-mark-rev t-since-cxx17">(C++17)</span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">pmr</span><span class="sy4">::</span><span class="me2">basic_string</span><span class="sy1">&lt;</span><span class="kw4">wchar_t</span><span class="sy1">&gt;</span></span></span>
</td></tr>

<tr class="t-dsc">
<td>  <span class="t-lc">std::pmr::u8string</span> <span class="t-mark-rev t-since-cxx20">(C++20)</span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">pmr</span><span class="sy4">::</span><span class="me2">basic_string</span><span class="sy1">&lt;</span>char8_t<span class="sy1">&gt;</span></span></span>
</td></tr>

<tr class="t-dsc">
<td>  <span class="t-lc"><strong class="selflink">std::pmr::u16string</strong></span> <span class="t-mark-rev t-since-cxx17">(C++17)</span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">pmr</span><span class="sy4">::</span><span class="me2">basic_string</span><span class="sy1">&lt;</span><span class="kw4">char16_t</span><span class="sy1">&gt;</span></span></span>
</td></tr>

<tr class="t-dsc">
<td>  <span class="t-lc"><strong class="selflink">std::pmr::u32string</strong></span> <span class="t-mark-rev t-since-cxx17">(C++17)</span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">pmr</span><span class="sy4">::</span><span class="me2">basic_string</span><span class="sy1">&lt;</span><span class="kw4">char32_t</span><span class="sy1">&gt;</span></span></span>
</td></tr>
</table>
<h3><span class="mw-headline" id=".E6.A8.A1.E6.9D.BF.E5.BD.A2.E5.8F.82">模板形参</span></h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  CharT
</td>
<td> -
</td>
<td>  字符类型
</td></tr>
<tr class="t-par">
<td>  Traits
</td>
<td> -
</td>
<td>  指定字符类型上操作的特性类
</td></tr>
<tr class="t-par">
<td>  Allocator
</td>
<td> -
</td>
<td>  用于分配内部存储的<a href="../named_req/Allocator.html" title="cpp/named req/Allocator"><i>分配器</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(Allocator)</span> </a>类型
</td></tr></table>
<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-sep">
<td colspan="2">  
</td></tr>
<tr class="t-dsc-hitem">
<td>  成员类型
</td>
<td>  定义
</td></tr>


<tr class="t-dsc">
<td>  <code>traits_type</code>
</td>
<td>  <code>Traits</code>
</td></tr>

<tr class="t-dsc">
<td>  <code>value_type</code>
</td>
<td>  <code>CharT</code>
</td></tr>

<tr class="t-dsc">
<td>  <code>allocator_type</code>
</td>
<td>  <code>Allocator</code> </td></tr>

<tr class="t-dsc">
<td>  <code>size_type</code>
</td>
<td>   <table class="t-rev-begin t-rev-begin-noborder"><tr class="t-rev t-until-cxx11"><td><code>Allocator::size_type</code></td>
<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td></tr><tr class="t-rev t-since-cxx11"><td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../memory/allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1">&lt;</span>Allocator<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">size_type</span></span></span></td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td></tr></table> </td></tr>

<tr class="t-dsc">
<td>  <code>difference_type</code>
</td>
<td>   <table class="t-rev-begin t-rev-begin-noborder"><tr class="t-rev t-until-cxx11"><td><code>Allocator::difference_type</code></td>
<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td></tr><tr class="t-rev t-since-cxx11"><td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../memory/allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1">&lt;</span>Allocator<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">difference_type</span></span></span></td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td></tr></table> </td></tr>

<tr class="t-dsc">
<td>  <code>reference</code>
</td>
<td>   <table class="t-rev-begin t-rev-begin-noborder"><tr class="t-rev t-until-cxx11"><td><code>Allocator::reference</code></td>
<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td></tr><tr class="t-rev t-since-cxx11"><td><code>value_type&amp;</code></td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td></tr></table> </td></tr>

<tr class="t-dsc">
<td>  <code>const_reference</code>
</td>
<td>   <table class="t-rev-begin t-rev-begin-noborder"><tr class="t-rev t-until-cxx11"><td><code>Allocator::const_reference</code></td>
<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td></tr><tr class="t-rev t-since-cxx11"><td><code>const value_type&amp;</code></td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td></tr></table> </td></tr>

<tr class="t-dsc">
<td>  <code>pointer</code>
</td>
<td>   <table class="t-rev-begin t-rev-begin-noborder"><tr class="t-rev t-until-cxx11"><td><code>Allocator::pointer</code></td>
<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td></tr><tr class="t-rev t-since-cxx11"><td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../memory/allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1">&lt;</span>Allocator<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">pointer</span></span></span></td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td></tr></table> </td></tr>

<tr class="t-dsc">
<td>  <code>const_pointer</code>
</td>
<td>   <table class="t-rev-begin t-rev-begin-noborder"><tr class="t-rev t-until-cxx11"><td><code>Allocator::const_pointer</code></td>
<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td></tr><tr class="t-rev t-since-cxx11"><td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../memory/allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1">&lt;</span>Allocator<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">const_pointer</span></span></span></td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td></tr></table> </td></tr>

<tr class="t-dsc">
<td>  <code>iterator</code>
</td>
<td> <a href="../named_req/RandomAccessIterator.html" title="cpp/named req/RandomAccessIterator"><i>遗留随机访问迭代器</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyRandomAccessIterator)</span> </a></td></tr>

<tr class="t-dsc">
<td>  <code>const_iterator</code>
</td>
<td>  常随机访问迭代器</td></tr>

<tr class="t-dsc">
<td>  <code>reverse_iterator</code>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../iterator/reverse_iterator.html"><span class="kw658">std::<span class="me2">reverse_iterator</span></span></a><span class="sy1">&lt;</span>iterator<span class="sy1">&gt;</span></span></span> </td></tr>

<tr class="t-dsc">
<td>  <code>const_reverse_iterator</code>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../iterator/reverse_iterator.html"><span class="kw658">std::<span class="me2">reverse_iterator</span></span></a><span class="sy1">&lt;</span>const_iterator<span class="sy1">&gt;</span></span></span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="basic_string/basic_string.html" title="cpp/string/basic string/basic string"> <span class="t-lines"><span>(构造函数)</span></span></a></div></div>
</td>
<td>  构造 <code>basic_string</code> <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><span class="t-lines"><span>(析构函数)</span></span></div></div>
</td>
<td>  销毁字符串，若使用内部存储则解分配它 <br> <span class="t-mark">(公开成员函数)</span>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/operator%3D.html" title="cpp/string/basic string/operator="> <span class="t-lines"><span>operator=</span></span></a></div></div>
</td>
<td>   为字符串赋值  <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/assign.html" title="cpp/string/basic string/assign"> <span class="t-lines"><span>assign</span></span></a></div></div>
</td>
<td>  赋值字符给字符串 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/get_allocator.html" title="cpp/string/basic string/get allocator"> <span class="t-lines"><span>get_allocator</span></span></a></div></div>
</td>
<td>   返回关联的分配器  <br> <span class="t-mark">(公开成员函数)</span> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id=".E5.85.83.E7.B4.A0.E8.AE.BF.E9.97.AE">  元素访问 </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/at.html" title="cpp/string/basic string/at"> <span class="t-lines"><span>at</span></span></a></div></div>
</td>
<td>  访问指定字符，有边界检查 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/operator_at.html" title="cpp/string/basic string/operator at"> <span class="t-lines"><span>operator[]</span></span></a></div></div>
</td>
<td>  访问指定字符 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/front.html" title="cpp/string/basic string/front"> <span class="t-lines"><span>front</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  访问首字符 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/back.html" title="cpp/string/basic string/back"> <span class="t-lines"><span>back</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  访问最后的字符 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/data.html" title="cpp/string/basic string/data"> <span class="t-lines"><span>data</span></span></a></div></div>
</td>
<td>  返回指向字符串首字符的指针 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/c_str.html" title="cpp/string/basic string/c str"> <span class="t-lines"><span>c_str</span></span></a></div></div>
</td>
<td>  返回字符串的不可修改的 C 字符数组版本 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/operator_basic_string_view.html" title="cpp/string/basic string/operator basic string view"> <span class="t-lines"><span>operator basic_string_view</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td>  返回到整个字符串的不可修改的 <code>basic_string_view</code> <br> <span class="t-mark">(公开成员函数)</span> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id=".E8.BF.AD.E4.BB.A3.E5.99.A8">  迭代器 </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/begin.html" title="cpp/string/basic string/begin"> <span class="t-lines"><span>begin</span><span>cbegin</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  返回指向起始的迭代器 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/end.html" title="cpp/string/basic string/end"> <span class="t-lines"><span>end </span><span>cend</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  返回指向末尾的迭代器 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/rbegin.html" title="cpp/string/basic string/rbegin"> <span class="t-lines"><span>rbegin</span><span> crbegin</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  返回指向起始的逆向迭代器 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/rend.html" title="cpp/string/basic string/rend"> <span class="t-lines"><span>rend</span><span> crend</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  返回指向末尾的逆向迭代器 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id=".E5.AE.B9.E9.87.8F">  容量 </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/empty.html" title="cpp/string/basic string/empty"> <span class="t-lines"><span>empty</span></span></a></div></div>
</td>
<td>  检查字符串是否为空 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/size.html" title="cpp/string/basic string/size"> <span class="t-lines"><span>size</span><span>length</span></span></a></div></div>
</td>
<td>  返回字符数 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/max_size.html" title="cpp/string/basic string/max size"> <span class="t-lines"><span>max_size</span></span></a></div></div>
</td>
<td>  返回字符数的最大值 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/reserve.html" title="cpp/string/basic string/reserve"> <span class="t-lines"><span>reserve</span></span></a></div></div>
</td>
<td>  保留存储 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="https://zh.cppreference.com/w/cpp/string/basic_string/capacity" title="cpp/string/basic string/capacity"> <span class="t-lines"><span>capacity</span></span></a></div></div>
</td>
<td>  返回当前对象分配的存储空间能保存的字符数量 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/shrink_to_fit.html" title="cpp/string/basic string/shrink to fit"> <span class="t-lines"><span>shrink_to_fit</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  通过释放不使用内存减少内存使用 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id=".E6.93.8D.E4.BD.9C">  操作 </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/clear.html" title="cpp/string/basic string/clear"> <span class="t-lines"><span>clear</span></span></a></div></div>
</td>
<td>  清除内容 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/insert.html" title="cpp/string/basic string/insert"> <span class="t-lines"><span>insert</span></span></a></div></div>
</td>
<td>  插入字符 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/erase.html" title="cpp/string/basic string/erase"> <span class="t-lines"><span>erase</span></span></a></div></div>
</td>
<td>  移除字符 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/push_back.html" title="cpp/string/basic string/push back"> <span class="t-lines"><span>push_back</span></span></a></div></div>
</td>
<td>  后附字符到结尾 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/pop_back.html" title="cpp/string/basic string/pop back"> <span class="t-lines"><span>pop_back</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  移除末尾字符 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/append.html" title="cpp/string/basic string/append"> <span class="t-lines"><span>append</span></span></a></div></div>
</td>
<td>  后附字符到结尾 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/operator%2B%3D.html" title="cpp/string/basic string/operator+="> <span class="t-lines"><span>operator+=</span></span></a></div></div>
</td>
<td>  后附字符到结尾 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/compare.html" title="cpp/string/basic string/compare"> <span class="t-lines"><span>compare</span></span></a></div></div>
</td>
<td>  比较二个字符串 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/starts_with.html" title="cpp/string/basic string/starts with"> <span class="t-lines"><span>starts_with</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  检查 string 是否始于给定前缀 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/ends_with.html" title="cpp/string/basic string/ends with"> <span class="t-lines"><span>ends_with</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  检查 string 是否终于给定后缀 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/replace.html" title="cpp/string/basic string/replace"> <span class="t-lines"><span>replace</span></span></a></div></div>
</td>
<td>  替换字符串的指定部分 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/substr.html" title="cpp/string/basic string/substr"> <span class="t-lines"><span>substr</span></span></a></div></div>
</td>
<td>  返回子串 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/copy.html" title="cpp/string/basic string/copy"> <span class="t-lines"><span>copy</span></span></a></div></div>
</td>
<td>  复制字符 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/resize.html" title="cpp/string/basic string/resize"> <span class="t-lines"><span>resize</span></span></a></div></div>
</td>
<td>  更改存储的字符数 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/swap.html" title="cpp/string/basic string/swap"> <span class="t-lines"><span>swap</span></span></a></div></div>
</td>
<td>  交换内容 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id=".E6.9F.A5.E6.89.BE">  查找 </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/find.html" title="cpp/string/basic string/find"> <span class="t-lines"><span>find</span></span></a></div></div>
</td>
<td>  于字符串中寻找字符 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/rfind.html" title="cpp/string/basic string/rfind"> <span class="t-lines"><span>rfind</span></span></a></div></div>
</td>
<td>  寻找子串的最后一次出现 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/find_first_of.html" title="cpp/string/basic string/find first of"> <span class="t-lines"><span>find_first_of</span></span></a></div></div>
</td>
<td>  寻找字符的首次出现 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/find_first_not_of.html" title="cpp/string/basic string/find first not of"> <span class="t-lines"><span>find_first_not_of</span></span></a></div></div>
</td>
<td>  寻找字符的首次缺失 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/find_last_of.html" title="cpp/string/basic string/find last of"> <span class="t-lines"><span>find_last_of</span></span></a></div></div>
</td>
<td>  寻找字符的最后一次出现 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/find_last_not_of.html" title="cpp/string/basic string/find last not of"> <span class="t-lines"><span>find_last_not_of</span></span></a></div></div>
</td>
<td>  寻找字符的最后一次缺失 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>


<tr>
<td colspan="2"> <h3> <span class="mw-headline" id=".E5.B8.B8.E9.87.8F"> 常量</span></h3>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/npos.html" title="cpp/string/basic string/npos"> <span class="t-lines"><span>npos</span></span></a></div><div><span class="t-lines"><span><span class="t-cmark">[静态]</span></span></span></div></div>
</td>
<td>  特殊值。准确含义依赖语境 <br> <span class="t-mark">(公开静态成员常量)</span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E9.9D.9E.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">非成员函数</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/operator%2B.html" title="cpp/string/basic string/operator+"> <span class="t-lines"><span>operator+</span></span></a></div></div>
</td>
<td>   连接两个字符串或者一个字符串和一个字符  <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/operator_cmp.html" title="cpp/string/basic string/operator cmp"> <span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator&lt;</span><span>operator&gt;</span><span>operator&lt;=</span><span>operator&gt;=</span><span>operator&lt;=&gt;</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  以字典序比较两个字符串 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/swap2.html" title="cpp/string/basic string/swap2"> <span class="t-lines"><span>std::swap<span class="t-dsc-small">(std::basic_string)</span></span></span></a></div></div>
</td>
<td>   特化 <span class="t-lc"><a href="../algorithm/swap.html" title="cpp/algorithm/swap">std::swap</a></span> 算法 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/erase2.html" title="cpp/string/basic string/erase2"> <span class="t-lines"><span>erase<span class="t-dsc-small">(std::basic_string)</span></span><span>erase_if<span class="t-dsc-small">(std::basic_string)</span></span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>  擦除所有满足特定判别标准的元素 <br> <span class="t-mark">(函数模板)</span> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id=".E8.BE.93.E5.85.A5.2F.E8.BE.93.E5.87.BA">  输入/输出 </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/operator_ltltgtgt.html" title="cpp/string/basic string/operator ltltgtgt"> <span class="t-lines"><span>operator&lt;&lt;</span><span>operator&gt;&gt;</span></span></a></div></div>
</td>
<td>  执行字符串的流输入与输出 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/getline.html" title="cpp/string/basic string/getline"> <span class="t-lines"><span>getline</span></span></a></div></div>
</td>
<td>  从 I/O 流读取数据到字符串 <br> <span class="t-mark">(函数模板)</span> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id=".E6.95.B0.E5.80.BC.E8.BD.AC.E6.8D.A2">  数值转换 </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/stol.html" title="cpp/string/basic string/stol"> <span class="t-lines"><span>stoi</span><span>stol</span><span>stoll</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  转换字符串为有符号整数 <br> <span class="t-mark">(函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/stoul.html" title="cpp/string/basic string/stoul"> <span class="t-lines"><span>stoul</span><span>stoull</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  转换字符串为无符号整数 <br> <span class="t-mark">(函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/stof.html" title="cpp/string/basic string/stof"> <span class="t-lines"><span>stof</span><span>stod</span><span>stold</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  转换字符串为浮点值 <br> <span class="t-mark">(函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/to_string.html" title="cpp/string/basic string/to string"> <span class="t-lines"><span>to_string</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  转换整数或浮点值为 <code>string</code> <br> <span class="t-mark">(函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/to_wstring.html" title="cpp/string/basic string/to wstring"> <span class="t-lines"><span>to_wstring</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td>  转换整数或浮点值为 <code>wstring</code> <br> <span class="t-mark">(函数)</span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E5.AD.97.E9.9D.A2.E9.87.8F">字面量</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>定义于内联命名空间 <code>std::literals::string_literals</code></div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/operator%2522%2522s.html" title='cpp/string/basic string/operator""s'> <span class="t-lines"><span>operator""s</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div>
</td>
<td>  转换字符数组字面量为 <code>basic_string</code> <br> <span class="t-mark">(函数)</span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E8.BE.85.E5.8A.A9.E7.B1.BB">辅助类</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="basic_string/hash.html" title="cpp/string/basic string/hash"> <span class="t-lines"><span>std::hash<span class="t-dsc-small">&lt;std::string&gt;</span></span><span>std::hash<span class="t-dsc-small">&lt;std::u8string&gt;</span></span><span>std::hash<span class="t-dsc-small">&lt;std::u16string&gt;</span></span><span>std::hash<span class="t-dsc-small">&lt;std::u32string&gt;</span></span><span>std::hash<span class="t-dsc-small">&lt;std::wstring&gt;</span></span><span>std::hash<span class="t-dsc-small">&lt;std::pmr::string&gt;</span></span><span>std::hash<span class="t-dsc-small">&lt;std::pmr::u8string&gt;</span></span><span>std::hash<span class="t-dsc-small">&lt;std::pmr::u16string&gt;</span></span><span>std::hash<span class="t-dsc-small">&lt;std::pmr::u32string&gt;</span></span><span>std::hash<span class="t-dsc-small">&lt;std::pmr::wstring&gt;</span></span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div>
</td>
<td>   string 的哈希支持  <br> <span class="t-mark">(类模板特化)</span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E6.8E.A8.E5.AF.BC.E6.8C.87.E5.BC.95.28C.2B.2B17_.E8.B5.B7.29"><a href="basic_string/deduction_guides.html" title="cpp/string/basic string/deduction guides">推导指引</a><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></span></h3>

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